Selling Part of Your Garden for Development

What makes a garden or backland plot developable?

A garden plot works when a new home can sit comfortably on it without spoiling your house or your neighbours'. Buyers and planners look first at:

Access: a safe route to the road that is wide enough, with good visibility and room for bins and emergency vehicles
Size and shape: space for a home, parking and a usable garden for both properties
Neighbours: overlooking, overshadowing and the outlook from surrounding windows
Character: whether a new building fits the pattern of the street
Trees, drainage and services: protected trees, a foul drainage connection, surface water, and water and electricity supplies, some of which may need rights across neighbouring land

Corner plots, long rear gardens with room for a side access, and gardens backing onto a lane are often the most promising. A plot that could only be reached through your house, or that sits close to neighbours' windows, is much harder. Our guide to what makes land developable covers these checks in more detail.

What do planners look at?

Councils judge garden plots against their local plan policies, which often deal specifically with backland and tandem development. Many councils also have local design guidance on garden sizes, parking and the distance between facing windows, so read it before drawing up a scheme.

In England, national policy does not treat gardens in built-up areas as previously developed land. The August 2026 NPPF gives substantial weight to extra homes within settlements that meet certain tests. Where a scheme uses residential gardens, those tests include keeping the new footprint within twice that of the existing buildings and retaining at least half of the undeveloped garden, unless going further would not harm the area's character. Daylight, privacy and outdoor space for neighbours must remain acceptable.

Since 6 August 2026, non-major sites in England of 0.2 hectares or less are exempt from mandatory biodiversity net gain unless priority habitat is affected. In Wales, plots are assessed against the Local Development Plan and Planning Policy Wales, and drainage for more than one home, or a construction area of 100 square metres or more, needs approval from the council's SuDS Approving Body.

Should I sell with or without planning permission?

There are three common approaches:

Sell without permission: quicker to agree, but the price reflects the planning risk.
Sell subject to planning: you exchange contracts now and the buyer applies for permission, completing only if a satisfactory permission is granted by a longstop date.
Get permission first: you take on the cost and risk of the application yourself, in return for selling a plot with more certainty.

In England, a small plot can also be tested through Permission in Principle, available for housing-led schemes of fewer than 10 homes on sites under one hectare, with a five-week decision target. It establishes that the site is suitable for a specified amount of housing-led development, but technical details consent is needed before building can start. Wales has no Permission in Principle, and standard permissions there usually last five years rather than three.

How will selling part of my garden affect my home's value?

Your house will have a smaller garden, a new neighbour and, for a while, a building site next door. For some homes that reduces value noticeably; for others, especially those with large grounds, the effect may be small compared with the value of the plot. Ask an independent valuer to compare your home's value before and after, and weigh that against the sale price. A permission that already shows the design makes the effect easier to judge.

You can limit the impact through the contract, for example with covenants on height, window positions and boundary treatment, approval of the planning drawings, and agreed working hours and access during construction. If you sell before planning, an overage clause can give you a share of any extra value if the buyer later secures permission for more than expected.

What about access and neighbours?

Access is the most common deal-breaker. If the plot is reached along your drive, you will need to grant a right of way and agree who maintains it. Check whether the drive is entirely within your title and whether the road it joins is adopted. If the plot needs a route across someone else's land, a narrow strip owned by a third party can hold the whole site to ransom; our guide to access and ransom strips explains the risks.

Talk to neighbours early. They will be consulted on any planning application, and a scheme that has considered their privacy and outlook from the start tends to draw fewer objections. Sometimes neighbouring gardens can be combined into one better plot.

How is the title split, and does my lender need to agree?

Selling part of a registered title uses HM Land Registry form TP1, the transfer of part, with a plan showing the plot. Your solicitor will draft the rights each property needs, such as access, drainage and services, any rights you keep over the plot, fencing obligations and covenants.

If your home is mortgaged, the lender's charge covers the garden too. The lender must agree to release the plot, usually using form DS3, and may ask for part of the sale money to be paid off the mortgage or for a valuation of what remains. Contact your lender early, as this can take time.

What tax should I think about?

This is general information only, so speak to a tax adviser before you agree terms. HMRC's private residence relief guidance (helpsheet HS283) says:

garden and grounds of up to half a hectare normally qualify for relief when sold as part of your home's grounds
larger grounds qualify only up to the area needed for the reasonable enjoyment of the house, and selling part of them should be reported on your tax return
if you sell the garden after you have sold your home, no relief is available
land that has been fenced or divided off from your garden for development at the date of sale does not qualify

Building and selling a house yourself can be taxed differently from selling a plot. The order and timing of each step matter, especially if you are also planning to move, which is why advice before you start is worth having. Keep records of how the land has been used as garden, as HMRC may ask.

How do we buy garden plots?

We buy garden and backland plots across England and Wales, with or without planning permission, either outright or through a subject-to-planning contract. Our site appraisal is free and carries no obligation, and there is nothing to pay us. Tell us roughly where the plot is, its size, how it would be reached and any planning history. Any purchase is subject to survey, title and contract, and we encourage every owner to take independent legal, planning and tax advice. See what we look for in garden and backland plots.

Questions

Do I need planning permission before I sell part of my garden?

No. You can sell a plot with or without planning permission. Selling with permission gives the buyer more certainty, while a subject-to-planning contract lets you agree terms now and complete only if permission is granted. Selling without permission is quicker to agree but the price will reflect the planning risk.

Will I have to pay capital gains tax on the plot?

It depends. HMRC guidance says garden and grounds of up to half a hectare normally qualify for private residence relief, but relief is lost if you sell the garden after the house, or if the plot was fenced off for development before the sale. Speak to a tax adviser before agreeing terms.

Can I control what the buyer builds?

To a degree, through the contract. Owners often negotiate covenants on height, windows and boundaries, approval of the planning drawings, and rules on access and working hours during construction. These need careful drafting by your solicitor, and anything not written into the contract is unlikely to be enforceable later.

What if my mortgage lender will not release the plot?

Talk to the lender before agreeing a sale. Most lenders will consider a release, but they may want a valuation, part of the sale money paid off the mortgage, or evidence that your home still meets their lending criteria. Your solicitor can deal with the release form on completion.

Sources

This guide is general information, not legal, planning or tax advice. Always take independent professional advice on your own circumstances.

Selling part of your garden or a backland plot for development